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Message: <blockquote data-quote="ttocs" data-source="post: 1486311" data-attributes="member: 11896">The stock switch harness has been known to melt for years now just because of the heat that builds up in it.  I don't think I have ever heard of anything specifically that causes it to melt as far as shorting wires front or rear, just that its a known weak point.  "(the wires are color coded it’s impossible to get it wrong)" - I have been doing automotive wiring for almost 30 years and I have yet to know of a system that has been made that makes it impossible to be wrong or for someone wire it wrong.  I have seen harnesses that have the pins in incorrect places or wire colors that almost match but if you look closely maybe it a dark blue wire, not black and as much as I pride myself on testing all my connections before I connect to them, I have screwed them up.  If it were me I would be looking up that specific wire harness and again triple checking that the wires are going to the correct part on the harness or that there maybe isn't a connection that has shorted out once you put it all back together.  Shit happens.But as he said this will not cause the car to run bad.  I am not sure if your confusing the ignition system(coil/dist/ect) with the 12v switched ignition wire that powers the system.  The switched/ignition wire powers the system but if another system is drawing too much current from that wire it would just pop a fuse.</blockquote>